<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>第一个JS程序</title>
		<!--<style>
			div{
				width: 200px;
				height: 200px;
				border: 2px solid yellow;
				border-radius: 50%;
				text-align: center;
				line-height: 200px;
			}
		</style>-->
		<link rel="stylesheet" href="hello.css" />
	</head>
	<body>
		<div>123</div>
		<!--1、JS代码直接写在script标签内-->
		<!--<script>
			alert("Hello JavaScript");
		</script>-->		
			
		<!--2、引用外部文件-->
		<script src="hello.js"></script>
		
		
	</body>
</html>
